Take a look at the "Arrow" episode "The Demon," written by Benjamin Raab, Deric A. Hughes and directed by Mark Bunting, airing November 12, 2018 on The CW:
"...'Felicity' (Emily Bett Rickards) learns something new about 'Oliver' (Stephen Amell) that shocks her.
"Meanwhile, 'Diggle' (David Ramsey) asks 'Curtis' (Echo Kellum) to go undercover for 'ARGUS'.
"Then 'Dinah' (Juliana Harkavy) goes to work with an unlikely ally..."
Click the images to enlarge and Sneak Peek "Arrow: The Demon"...